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1. 

   StephenFromNYC
   Moderator

   Wednesday September 8, 2010

   Hello,

   I am confused by the pin assignments for serial input.

   Based on the silk-screening on my Maple Rev3 (summer 2010) I thought the three serial ports used the following pins on Maple board:

   Serial1: TX1 (pin 07) RX1 (pin 08)
   Serial2: TX2 (pin 01) RX2 (pin 00)
   Serial3: TX3 (pin 29) RX3 (pin 30)

   This information is the same as file: usart.html

   However, the information appears to be different in file: \hardware\leaflabs\cores\maple\HardwareSerial.cpp

   #define USART1_TX_PORT GPIOA_BASE
   #define USART1_TX_PIN 9
   #define USART1_RX_PORT GPIOA_BASE
   #define USART1_RX_PIN 10

   #define USART2_TX_PORT GPIOA_BASE
   #define USART2_TX_PIN 2
   #define USART2_RX_PORT GPIOA_BASE
   #define USART2_RX_PIN 3

   #define USART3_TX_PORT GPIOB_BASE
   #define USART3_TX_PIN 10
   #define USART3_RX_PORT GPIOB_BASE
   #define USART3_RX_PIN 11

   The code in HardwareSerial.cpp seems to suggest the pins are 9, 10, 2, 3, 10 (again), and 11.

   I am using Windows XP Professional SP3 and Maple IDE 0.0.6.

   Thanks!

   Stephen from NYC

   Posted 5 years ago #
2. 

   snigelen
   Member

   On the silkscreen there is "Arduino"-numbers, and in the source code there is physical stm32 port and pin numbers. For example USART3_TX is on PORTB pin 10 and USART1_RX is on PORTA pin 10. The mappings can be found in the Pin Mapping Mega Table.

   Posted 5 years ago #
3. 

   StephenFromNYC
   Moderator

   Wednesday September 8, 2010

   Hello-

   snigelen, thanks for the thoughts.

   I was not overly concerned about the repeat of pin 10 since I saw the different ports (GPIOA_BASE and GPIOB_BASE).

   Yes, in the link you sent me the data from the second column ("STM32 Pin") matches the definitions from HardwareSerial.cpp.

   Thanks!

   Stephen from NYC

   Posted 5 years ago #

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